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Install and run a virtual environment in python

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It installs a virtual environment in python which helps in working with different versions of the packages, it helps avoiding broken permissions and conflicting behaviour with the system package manager.

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    Step 1: Install Python and its package manager pip

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    Before installing a virtual environment, make sure Python and its package manager pip is installed on your system.

    sudo apt-get install python3-pip
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    Step 2: Install virtualenv package

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    To create a virtual environment, you need to install the virtualenv package.
    pip install virtualenv
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    Step 3: Create a virtual environment

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    Create a new virtual environment using the virtualenv command and give it a name of your choice.

    virtualenv <env_name>
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    Step 4: Activate the virtual environment

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    To start using the virtual environment, activate it.

    source <env_name>/bin/activate
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    Step 5: Verify the virtual environment

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    Check if the virtual environment is activated and working correctly. which command shows the location of python installed in the virtual environment.

    which python3 python3 --version
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    Step 6: (Safety check) Make virtual environment required for pip to install packages

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    To avoid polluting your system environment by mistake add the require_virtualenv attribute as True in pip's config file with global behaviour. To look at the contents of pip's config file (cat ~/.pip/pip.conf OR cat ~/.config/pip/pip.conf).

    pip config set global.require_virtualenv True
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    1. 6.1

      To check the pip's configuration file for require_virtualenv attribute to be true

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      This task is to observe whether the require_virtualenv is True or not.

      pip config debug
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    2. 6.2

      To list all packages installed in the environment

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      This task lists all the installed packages in a virtual environment.

      pip list --local
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    Step 7: Deactivate a virtual environment in python

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    This task deactivates or logs out of the virtual environment.

    deactivate
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    Step 8: Remove the virtual environment in python

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    This task removes the virtual environment directory from the file system.

    rm -r <env_name>
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